Reinforcing-bar for concrete structures.



I A. G. KUESTER. REINFOBUING BAR FOR CONCRETE STRUCTURES.

' APPLIOATIONVIILED 111111.27, 1907 947,199. Patented m. 18,1910.

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' UNITED STATES PATENT OFFICE.

ALBERT C. KUESTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR- T6 THE SCOFIELD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RE INFORCING-BAR FOR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented Jan. 18, 1910.

Application filed March 2'7, 1907. Serial No. 364,838.

tion, which while having its parts so ar-" ranged that any section takenin a plane at right angles to its longitudinal axis shall be equal inarea to any other section similarly taken at any other part of itslength, shall also he easy to roll as well as possess to a high degree,the various characteristics necessary in reinforcing bars, for use instructures of the class noted.

I further desire to provide a reinforcing bar of the above generalcharacter which shall be provided with projecting portions at intervalsalong its length, of such configurations as will permit of theirformation by,

rollseasily made and maintained in good condition, and which shallsatisfactorily act to tie together the various parts of the structure inwhich the bar is embedded.

These objects I attain as hereinafter set forth, reference being had tothe accompanying drawings, in which:

Figure 1, is a side elevation of a length of my improved reinforcingbar; Fig. 2, is a plan of the-bar illustrated in Fig. 1, and Fig. 3, isa vertical section taken on the line 3-4:, Fig. 1.

In the above drawings, represents the body of the bar, which will beseen from tion.

untilit reaches the edges of the bar where it coincides with said edges.From each edge of this rojecting'portion b, there extend inclineportions 6, sloping downwardly longitu inally of the bar, theprojections being so spaced that the distance between their adjacentportions 6 is, at their nearest points, substantially equal to the widthof the portion 7). Moreover the projections. B on one side of the barare placed so as to be midway between a pair I of projections B on theopposite side of thebar ;--the result of this construction being thatanytransverse section of the bar is sub stantially equal in area to anyother transverse section thereof, regardless of where it is taken. As aresult, it is obvious that in rolling the bar there is no surplus matterto be taken care of as the piece under treatment is passed through therolls,'and moreover, when the bar is in use, its tensile strength issubstantially the same at all points of its length. The nature of theprojections is also such that the bar makes asatisfactory bond with theconcrete of the structure in which it is embedded, in asmuch as theyconstitute isolated trans verse ribs which cfl'cctually renderimpossible any relative movement between the bar and the body ofconcrete.

In order to facilitate the making of rolls, I may make the groovestherein for forming the projecting portions B and B with a millingcutter, in which case all transverse circular elei'nents of the surface7) will be concentric with the transverse circular clomenis of thesurface l); thus making all' transverse sectional areas of the barsubstantially equal in area, although not mathemab ically so.

I claim:

1. A. reinforcing bar of equal transverse sectional areas throughoutitslength, said bar having two series of projections on opposite sidesthereof, the )l'0j(.(ftl()llS of one series b'eing oppositethe spacesbetween the projections of 'the other series and being equal. in area ofcross section to said spaccs in a median plane of the bar, saidprojections diminishing in cross section from such plane to the sides ofthe bar. I

2. A reinforcing bar of substantially equal transverse sectional areathroughout its length, said bar having two series of projcctions onopposite sides thereof, the projections of one series being opposite thespaces between the projections of the other series and each consistingof an independent transvers'ely extending rib, each projection and thespace between a pair of ad acent pro ectil) 92% Mame tions being ofsubstantially equal area. of cross section in amcdian planeof the bar,and said projeetionssloping or decreasing in height from such medianplane to the sides of the bar, i 7

3. A reinforcing bar having a body of elliptical section and providedwith two series of projections on opposite sides thereof, the area oilcross section of the projections on each side of the bar beingsubstantially equal to the area of cross section of the spaces betweenthe projections at the median plane of the bar each of said projectionsdin'iinishing in width and height from such ncdi an plane to the sidesof the ban I 4. A reinforcing bar consisting of a substantially roundbody provided with opposite longitudii'ial series of transverselyarranged bemding projections, the separate s rics of projectionsprojecting from dian'iotrically opposite portions of the bar body, andthe projections of one series boinq in staggered relation to theprojections of the opposite series, each of said nojeclions on circlingapproximately one-half oi the circumference of the bar body and boin oi' a tapering projection -from its highest point: to its oppositeterminals, and the projections in the two opposite rows being disposedin directly adjoining and abutting relation.

In testimony whereof, l have signed my name to this s ieciticaiiom inthe presence of two subscribing witnesses. 4

ALBERT Cl. h UES'PER.

Witn eases

